package com.example.common.chapter04;

import java.util.concurrent.TimeUnit;

public class Profile {

    private static final ThreadLocal<Long> TIME_THREADLOCAL = new ThreadLocal<>(){
        protected Long initialValue() {
            return System.currentTimeMillis();
        }
    };

    public static final void begin() {
        TIME_THREADLOCAL.set(System.currentTimeMillis());
    }

    public static final long end() {
        return System.currentTimeMillis() - TIME_THREADLOCAL.get();
    }

    public static void main(String[] args) throws InterruptedException {
        Profile.begin();
        TimeUnit.SECONDS.sleep(1);
        System.out.println("Cost:" + Profile.end() + "mills");
    }
}
